Drag-line excavator.



I ROYS.

DRAG LINE EXCAVATQR.

APPLICATION FILED MAY 3. I9I3.

Patented Apr. 13, I915.

' grammatically in one niaaaae.

- edge DRAW-LINE EXCAVATWR.

To aZZ whom. it may concern:

Be it known that I, Lawrence Roars, a citizen of the United States, residing at South Milwaukee, in the'county of Milwaukee and Stateof Wisconsin, have invented a certain new and useful Improvement in Drag-Line Excavators, of which the follow in is a specification.

tfy invention relates to improvements 1n drag line excavators and is illustrated diaform in the -accom-' panying drawing, whereinv Figure 1 shows the bucket about to be hoisted; Fig. 2 shows the bucket in the carrying position; and Fig. 3 shows the bucket in the dumping position.

Like parts are indicated by like letters throughout the several fi res.

he excavating bucket which is open at top and front is provided along the bottom in front with the cutting ip A The sides of' the bucket are cut away upwardly and forwardly from the cutting lip and terminate in upwardly projecting fingers .A connected by the reinforcing strip or member A located above the upper edge of the sides. The anchor in A is centrally attached to the back en of the bucket. A hoisting yoke or bail A is attached pivotally or rotatably to the bucket at the polnt A substantially at the center of gravity. A sheave A is rotatably mounted on this yoke or bail and a sheave A8 is pivotally mounted free to swing with respect thereto. A dragline yoke or bail A is pivotally or rotatably attached to the sides of the bucket near the front end in front of and slightly above the cutting lip or edge. A bridle A is attached to the tie member A passes over the sheave A and attached at its other end to the outer end of the yoke or bail A. The drag line A is attached to the outer end of the bail A and with it and the bridle forms What is in efl'ect a loop on the end of the drag line, since the bail is a substantial continuance of the drag line and might even take the form of a cable or flexible member instead of the rigid bail.

The drag line A leads to any suitable form of hoisting engine not shown upon a derrick or boom support not shown from which rises the boom B. The boom 18 has rotatably mounted thereon the sheaves B and B A hoisting cable B leads from the hoisting engine on the derrick frame not shown, over Specification of Letters JPatent.

Patented Apr... f3, timid.

Application nledl may 3, 11913. terlal No. 765,230.

the sheave 18 down over back over the sheave B to form a loop and then over the sheave B to the lug A where it is anchored or attached to the bucket.

he hOIStlIIg IL'O PB thus takes the form of a chored or attached to the back end of the bucket. In effect, then, it provide a hoisting rope one part of which is rigidly attached to the bucket and the other two parts of which have a movable connection .with the bucket yoke, the bucket yoke in turn having a movable connection with the loop on the end of the drag line.

The hoisting line in efi'ect comprises a depending loop and end, the latter secured anywhere back of the center of gravity but preferably,of course, near the end of the bucket, The connection between the loop and the yoke is a movable one, of course, and this is loop.

he drag line has in sheet a loop whereby it is connected near the forward end of the bucket and this loop has a movable connection with the loop of the hoistpreferably with the use of a sheave. These two movable connections are, however, most conveniently attached to or near the end of the yoke. The yoke itself is preferably pivoted at the center of gravity though it might be removed from the center of gravity. The operation does not depend upon this connection being at the center of gravity. The drag line loop preferably is formed in part of a rigid bail.

It will be evident that, while I have shown in my drawing an operative device, still many changes might be made in size, shape and arrangement of parts without deing line, and this is accomplished, of course,

parting materially from the spirit of my in-- ventlon, and T drawing be matic.

The use and operation of my invention are as follows: When the bucket is in the excavating position the hoisting rope is slack and the hoising bailis inclined to ward the front of the bucket. The drag line bail extends forwardly from the front of the bucket, being pivoted thereto at a point slightly above the point of application of the excavating resistance. When the drag line is hauled init tends to drag the bucket forward and owingto the fact that wish, therefore,

that my regarded as in a sense diagramthe sheave A and i referably a sheave riding in the the drag line bail is thus attached above the digging line it tends to tip the bucket slightly downwardly forward to enable the cutting lip to dig. This dragging movement will continue until the bucket is filled, all of the parts on the hoisting line being slack. 1

Without sla kening the drag line the hoisting rope is now drawn in tending to rotate the hoisting bail as shown in Fig. 1 about its pivotal point-on the bucket, back from the front end of the bucket until it assumes a substantially vertical position as shown in Fig. 2. T i bridle A and the bucket has now a lifting force applied to itat three points, namely,

at the point A where it is lifted by the dead end of the cable B at the pivotal point of the hoisting bail, and at the point of application of the bridle. As the cable B continues to be drawn in to lift the bucket the bucket rises and to rise it is lifted above the drag line and instantly the drag line commences to exert a force on the end of the drag line bail which has a downward component and this downward component tends to rotate the drag line bail toward the position shown in Fig. 2. As this bail rotates it forces the bridle A to approach parallelism with itself and this. compels the sheave A to travel along the bridle is attached to the bucket. The result of this is to rotate the hoisting bail toward the front end of the bucket, and, since the hoisting bail is being lifted and cannot descend, the front end of the bucket must rotate and rise toward the hoisting bail, thus lifting the front end of the bucket more rapidly at first than the rear enduntil it reaches the position shown in Fig.. 2 and then holding the bucket with its front elevated as there shown.

To dump the bucket it is only necessary to release the tension of the drag line. The weight of the front end of the bucket which is being supported by the end of the bridle will now no longer be supported by the bridle because re easing the dra line releases the tension on the bridle. he front end of the bucket will then drop and the drag line bail willswing up to the position shown in Fig. 3, thus permitting the front end of the bucket to fall away from the hoisting bail into the dumping position shown in Fig. 3 when the material can slide out. The tension on the end of the cable B applied to the bucket at A of course being unbalanced in the dumping position by the tension of the bridle tends to raise the rear end of the bucket and force it into the dumping position. The fact that the end of the bridle A is attached to the yoke A at a point intermediate the pivotal point of the yoke and the point at which the drag s tightens up the the instant it commences the bridle toward the point at which- ,drag line loop being formed in part 0 1. In a drag line excavator the combination of an excavating bucket with a hoisting line having a downwardly depending loop and end, the latter attached near the rear of the bucket, a hoisting yoke attached near the middle of the bucket and havin a movable connection with the loop of the%ine, a drag line having a loop attached near the forward end of the bucket and a connection between and movable on the two loops.

2. In a drag line excavator the combination of an excavating bucket with a hoisting line having a downwardly depending loop and end, the latter attached near the rear of the bucket, a hoisting yoke attached near the middle of the bucket, a sheave in the loop of the line attached to the end of the hoisting yoke, a drag line having a loop attached near the forward end of the bucket and a sheave in such loop attached to the yoke. p

3. In a drag line excavator the combination of an excavating bucket with a hoisting line having a downwardly depending loop and end, the latter attached near the rear of the bucket, a hoisting yoke attached near the middle of the bucket and having a movable connection with the loop of the line, a drag line having a loop attac ed near the forward end of the bucket and a connection between and movable on the two 100 s, the a bail from the drag line proper to the forward end of the bucket.

4. In a drag line excavator the combination of an excavating bucket with a hoisting line having a downwardly depending loop and end, the latter attached near the rear of the bucket, a hoisting yoke attached near the middle of the bucket, a sheave in the loop of the line attached to the end of the yoke,

a drag line havin a loop attached near the forward end of t e bucket and a sheave in such loop attached to the yoke, the drag line loop being formed in art of a bail from the dra line proper to t e forward end of the buc et.

5. In a dragline excavator the combination of an excavating bucket with a hoisting line having a downwardly depending loop and end, the latter attached near the rear of the bucket, a hoisting yoke attached near the middle of the bucket, a drag line having a loop attached near the forward end of the nietpae lbucket and connections from the hoisting yoke to both loops and movable thereon.

6. In a drag line excavator the tion of an excavating bucket with a hoisting rob line having a downwardly depending loop and end, the latter attached near the rear of the bucket, a hoisting yoke attached'near the middle of the bucket, a drag line having a loop attached near the forward end of the ucket, connections from the yoke to both loops and movable thereon comprising sheaves one in each loop and both attachedto the yoke.

7. In a drag line excavator the combination of an excavating bucket with a hoisting line having a downwardly depending loop and end, the latter attached near the rear of the bucket, a hoisting yoke attached near the midle of the bucket, a drag line having a loop attached near the forward end of the bucket and connections from the yoke to both loops and movable thereon, the drag line loop be ing formed in part of a bail from the drag line proper to the forward end of the bucket.

8. In a drag line excavator. the combination of an excavating bucket with a hoisting line having a downwardly depending loop and end, the latter attached near the rear of combina- 9. In a drag line excavator the combination of a bucket with a hoisting bail pivotally mounted thereon, tached at the rear end movable engagement with the hoisting bail, a drag line bail pivotally attached to the front endof the bucket and a drag line attached to said bail and a controlling line at tached at one end to said bail and at the other end to the front 7 in movable connection with the hoisting bail.

7 In testimony whereof, I afiix my signature in the presence of two witnesses this 18th day of April 1913.

" LAWRENCE ROYS.

a hoisting line at- Witnesses:

W. J. RYAN, H. D. TAYLOR.

end of the bucket andto the bucket and in v 

